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Layered ceramic composite material based on silicon nitride, and preparation method thereof

A technology of ceramic composite materials and silicon nitride, which is applied in the field of ceramic materials, can solve problems such as limiting the application of silicon nitride materials, and achieve the effects of overcoming fracture problems, improving brittleness, and simple preparation methods

Inactive Publication Date: 2020-01-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the brittleness of ceramic materials, the practical application of silicon nitride materials has always been limited.

Method used

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  • Layered ceramic composite material based on silicon nitride, and preparation method thereof
  • Layered ceramic composite material based on silicon nitride, and preparation method thereof
  • Layered ceramic composite material based on silicon nitride, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing a layered ceramic composite material based on silicon nitride, comprising the following steps:

[0038] 1) Ingredients: Weigh 24.56g of silicon nitride and 2.72g of Al according to the mass ratio 2 o 3 and Y 2 o 3 A mixture of sintering aids, and 8.25g of molybdenum powder. Among them, the purity of silicon nitride is 99.99%, the α phase is >94%, the average particle size is 0.3 μm, and the volume fraction is 90%, the purity of hexagonal boron nitride is 99.6%, the average particle size is 0.5 μm, Al 2 o 3 and Y 2 o 3 Purity>99.5%, average particle size 1μm, Al 2 o 3 1.63g, Y 2 o 3 It is 1.09g.

[0039] 2) Ball mill mixing: the weighed silicon nitride and Al 2 o 3 with Y 2 o 3 Put the sintering aid powder of the mixture in a ball mill jar, add zirconia balls, pour alcohol, adjust the fluid viscosity, and use a planetary ball mill to mix well at a speed of 50r min -1 , the ball milling time is 5h; wherein, the amount of zirconia bal...

Embodiment 2

[0049] A preparation method of a layered ceramic composite material based on silicon nitride, comprising the following steps:

[0050] Step 1) Ingredients: Weigh 25.0g of silicon nitride and 2.77g of Al according to mass ratio 2 O 3 and Y 2 O 3 Mixed sintering aid, and 6.87g of molybdenum powder. Among them, the purity of silicon nitride is 99.99%, the α phase is >94%, the average particle size is 0.3 μm, the volume fraction is 90%, the purity of hexagonal boron nitride is 99.6%, the average particle size is 0.5 μm, Al 2 O 3 and Y 2 O 3 Purity >99.5%, average particle size of 1μm, Al 2 O 3 1.66g, Y 2 O 3 is 1.11g.

[0051] Step 2) Ball-milling mixture: weighed silicon nitride and Al 2 O 3 with Y 2 O 3 The mixture of sintering aid powder is placed in a ball mill jar, zirconium dioxide balls are added, alcohol is poured in, the viscosity of the fluid is adjusted, and a planetary ball mill is used to fully mix at a speed of 100r·min -1 , the ball milling time is 5...

Embodiment 3

[0061] A preparation method of a layered ceramic composite material based on silicon nitride, comprising the following steps:

[0062] Step 1) Ingredients: Weigh 25.46g of silicon nitride and 2.83g of Al according to mass ratio 2 O 3 and Y 2 O 3 Mixed sintering aid, and 5.47g of molybdenum powder. Among them, the purity of silicon nitride is 99.99%, the α phase is >94%, the average particle size is 0.3 μm, the volume fraction is 90%, the purity of hexagonal boron nitride is 99.6%, the average particle size is 0.5 μm, Al 2 O 3 and Y 2 O 3 Purity >99.5%, average particle size of 1μm, Al 2 O 3 1.13g, Y 2 O 3 is 1.70g.

[0063] Step 2) Ball-milling mixture: weighed silicon nitride and Al 2 O 3 with Y 2 O 3 The mixture of sintering aid powder is placed in a ball mill jar, zirconium dioxide balls are added, alcohol is poured in, the viscosity of the fluid is adjusted, and a planetary ball mill is used to fully mix at a speed of 150r·min -1 , the ball milling time is ...

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Abstract

The invention discloses a layered ceramic composite material based on silicon nitride, and a preparation method thereof, and belongs to the field of ceramic materials. The preparation method comprises: using silicon nitride, hexagonal boron nitride and molybdenum as raw materials, and using a mixture of Al2O3 and Y2O3 as a sintering aid; mixing various ceramic powders, grinding, screening, weighing the mixed powder and molybdenum powder, putting into a metal mold, and carrying out cold pressing to form a biscuit; and sintering at a temperature of 1750-1850 DEG C under a pressure of 25-35 MPa in a nitrogen atmosphere to obtain the silicon nitride-based layered ceramic composite material. According to the invention, the obtained silicon nitride-based layered ceramic composite material retains high hardness and has good toughness.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a layered ceramic composite material based on silicon nitride and a preparation method thereof. Background technique [0002] As an important structural ceramic material, silicon nitride material has high hardness, low density, high temperature resistance and other properties, and can be used to manufacture mechanical structures such as bearings, gas turbine blades, mechanical seal rings, and permanent molds. However, due to the brittleness of ceramic materials, the practical application of silicon nitride materials has always been limited. Therefore, it is necessary to propose a method capable of improving the toughness of the silicon nitride material, so as to expand the application range of the silicon nitride material. Contents of the invention [0003] The object of the present invention is to provide a layered ceramic composite material based on silicon nitride and its p...

Claims

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Application Information

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IPC IPC(8): C04B35/584C04B35/622C04B35/64
CPCC04B35/584C04B35/622C04B35/64C04B2235/386C04B2235/602C04B2235/6567C04B2235/96
Inventor 陈威王昭勋
Owner SHAANXI UNIV OF SCI & TECH
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